Continuous automated determination of atmospheric formaldehyde at the parts per trillion level

1,3-Cyclohexanedione was used for automated near real-time fluorometric determination of atmospheric formaldehyde. Although previous literature reports indicate this reagent to be nonselective, adaptation of a fast flow injection technique that does not rely on the completion of the reaction provided a method with a selectivity factor of >300 for HCHO over its nearest congener, CH 3 CHO. The system was optimized with respect to the reagent and scrubber liquid composition, reaction temperature, and pH. The limit of detection (LOD) in the aqueous phase is ∼6 nM (180 ng/L) HCHO for a 45-μL sample (270 fmol) with the linear dynamic range spanning >3 orders of magnitude, up to at least 14 μM

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